/Engine/Plugins/2D/Paper2D/Source/Paper2D/Classes/PaperFlipbookComponent.h
Change the flipbook used by this instance (will reset the play time to 0 if it is a new flipbook).
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Sprite") virtual bool SetFlipbook ( class UPaperFlipbook * NewFlipbook )